3- to 14-μm Spectroscopy of Comet C/1999 T1 (McNaught-Hartley)

Details 3- to 14-μm Spectroscopy of Comet C/1999 T1 (McNaught-Hartley) 3- to 14-μm Spectroscopy of Comet C/1999 T1 (McNaught-Hartley)

Sep 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002icar..159..234l&link_type=abstract

Icarus, Volume 159, Issue 1, p. 234-238.

Physics

6

Scientific paper

We report spectroscopy of Comet C/1991 T1 (McNaught-Hartley) at 3-13 μm on January 31.62 and February 1.7 2001 UT (delta=1.29 AU, r=1.40 AU) using the broadband array spectrograph system on the IRTF. The spectrum showed a silicate emission feature extending about 20% above the continuum. Two emission features at 10.3 and 11.2 μm appeared above the silicate band, the latter seemingly indicative of crystalline olivine. The 10.3-μm feature is only a 1-2 sigma detection but if real could indicate the presence of hydrated silicates. The color temperature at 8-13 μm was 260+/-10 K, approximately 6% above the blackbody radiative equilibrium temperature of 235 K. The magnitude at [N] was 3.13+/-0.02. On the second night, the comet had brightened slightly ([N]=2.98+/-0.02) and the two prominent emission features were absent, although the silicate emission feature maintained its trapezoidal shape with shoulders at 9.5 and 11.2 μm.

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